<div align="center">
  <table style="text-align: center">
    <tr>
      <th>ID</th>
      <th>Name</th>
      <th>Sex</th>
      <th>Option</th>
    </tr>
    <tr *ngFor="let student of students">
      <td>{{student.id}}</td>
      <td>{{student.name}}</td>
      <td>{{student.sex}}</td>
      <td>稍后完成</td>
    </tr>
  </table>
  <!--(blue)="change()"-->
  每页显示：<input (keydown.enter)="change()" [(ngModel)]="pageSize" size="3">&nbsp;&nbsp;&nbsp;
  <button (click)="up()">上一页</button>
  {{pageNum}}
  <button (click)="down()">下一页</button>
  共
  {{pages}}
  页
</div>
